01144nas a2200133   4500008004100000245003300041210003200074300001200106490000700118520080900125653001700934100002000951856003900971       1969                        eng d00aGround Slates: East and West0 aGround Slates East and West  a385-3910 v343 a<p>Six major hypotheses have been advanced to account for ground slate industries containing knives, lance heads, and projectile points, found on opposite sides of the North American continent. Certain of these hypotheses assume genetic connections; others postulate separate sources and developments for such artifacts in the Northeast and North Pacific areas. A recent study of the cultures involved, chiefly Borden's (1962) Vancouver data, has indicated that: (1) ground slate artifacts made their initial appearance in both areas at about the same time; (2) the respective typologies are quite dissimilar; and (3) possible bone and/or chipped stone prototypes for certain of the specific ground slate forms exist in each area. These data suggest independent origins and developmental histories.</p>
10aanthropology1 aRitchie, W., A.  uhttp://www.jstor.org/stable/277735